Grabbed dndbeyond's source code

```
~/go/bin/sourcemapper -output ddb -jsurl https://media.dndbeyond.com/character-app/static/js/main.90aa78c5.js
```

ddb_main/tools/js/smartComponents/LoadingPlaceholder/LoadingPlaceholder.tsx

@@ -0,0 +1,18 @@
+import * as React from "react";
+
+import { AnimatedLoadingRingSvg } from "../Svg";
+
+interface LoadingPlaceholderProps {
+  label?: React.ReactNode;
+}
+
+const LoadingPlaceholder: React.FunctionComponent<LoadingPlaceholderProps> = ({
+  label = "Loading",
+}) => (
+  <div className="ddbc-loading-placeholder">
+    <AnimatedLoadingRingSvg className="ddbc-loading-placeholder__icon" />
+    <div className="ddbc-loading-placeholder__label">{label}</div>
+  </div>
+);
+
+export default React.memo(LoadingPlaceholder);